ST

The STDP4328 is a high-speed DisplayPort dual mode concentrator IC that facilitates routing of multiple HDMI or DP audio-video streams on a single DP connector. This device is targeted for audio-video routing and multiplexer applications in digital signage, universal docking stations and high-end 4K2K cameras, recorders, etc. Enterprise universal docking station designs can make use of STDP4328 to route video from multiple sources such as notebooks, smart phones, and tablets to share the desktop monitor space. High-end consumer products such as 4K2K cameras, recorders and players can make use of STDP4328 to transport a 4K2K 60 Hz uncompressed video and audio stream, which otherwise requires up to four HDMI connectors and cables. STDP4328 consists of two dual mode input ports and one dual mode output port, configurable as DisplayPort or HDMI/DVI. This device has VESA DP Standard Ver. 1.2a compliant receivers and transmitters supporting advanced features such as MST, HBR2, 3D formats, and GTC assist. Designs based on STDP4328 have the flexibility to offer either DP or HDMI/DVI connectors on its end product to interface with commercial and consumer video sources and displays. In addition, STDP4328 based products with a DisplayPort output connector are DP++ compliant which work with any HDMI or single link DVI displays through passive dongles (level translators).

The STDP4328 uses ST's latest generation DisplayPort dual mode receiver and transmitter technology that supports both DisplayPort and TMDS signal format. In DisplayPort configuration, the device receives either SST or MST streams through the two input ports and combines them as one MST stream at the output port: in MST mode, it supports up to 8 AV streams. For example, it can receive two 2K x 2K 60 Hz streams on each of the input ports and send them as two 2K2K 60 Hz virtual MST streams to drive a 4K2K display. The DisplayPort receiver and transmitter supports HBR2 speed, a data rate of 5.4 Gbps per lane with a total bandwidth of 21.6 Gbps link rate. In HDMI mode, this device supports a link rate up to 3.2 Gbps that corresponds to a pixel rate of 320 MHz, adequate for supporting video resolution up to FHD 120 Hz with all 3D formats. Two independent HDMI inputs can be converted into one DP MST output. The device is also capable of delivering deep color video up to 16-bits per color. It allows audio transport from the source to the desired audio rendering devices over the video output port or through the SPDIF port.

The STDP4328 supports RGB and YCC colorimetric formats with color depth of 16, 12, 10, and 8 bits. The device features the HDCP 1.3 content protection scheme with embedded keys for secure transmission of premium digital audio-video content. It also operates as an HDCP repeater for downstream sink.

The DDC ports allow the upstream source to access EDID and exchange MCCS commands with a downstream sink when the physical ports are either HDMI or DVI type. If both the upstream source and downstream sink are DP type, I2C transactions take place over the AUX CH. If the upstream is DP type and the downstream is either HDMI or DVI type, the device bridges DP AUX CH with downstream DDC port for all I2C-based protocol transactions. The device has an on-chip microcontroller with SPI, UART, and I2C interface. It uses an external SPI Flash ROM for storing device configuration firmware. It has an I2C slave port for external host communication. Other system interface signals include CEC signals and general purpose IO for source, sink communication, detection, monitoring, etc. When the downstream sink is disconnected, STDP4328 automatically enters into low power state.

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